Tool-retaining device for boring-bars.



H. MUELLER & A. G. SUHUERMANN. o. B. in A. MUELLER, nxnou'rons 0F H. MUELLER, nnq'n.

' TOOL RETAINING DEVICE FOR BORING BARS.

APPLIOATION FILED APR. 1, 1911.

1,034,723. Patented Aug. 6, 1912.

2 SHEETS-SHEET 1.

Anton G J'c/zuer mmm/ H. MUELLER & A. G. SGHUERMANN.

0.2. a A. MUELLER, sxnouwons or H. MUELLER, nno'n.

TOOL RETAINING DEVIUE FOR BORING BARS.

.APPLIOATION FILED APR 1, 1911.

1 ,O34,723. Patented Aug. 6, 1912.

2 SHEETS-SHEET 2.

TI E

dnfan 'Jcaermann To all whom it concern:

' new and useful head and tool v1de' an improved form of tool through the medium of which the tool I should become too of the said Be it knownthat HENRY MUELLER, deceased, late a citizen of the United States and resident of Decatur, countyof Macon, and State of Illinois, and Armor: 0. 'SCHUERMANN, a citizenof the United States,

and resident of Decatur, county of Macon,

and State of Illinois, did during the lifetime HENRY MUELLER certain new and useful Improvements in Tool-Retaining Devices for Boring-Baraof which the following is a specification.

Our present 'vention relatesto certain improvements in a'socket retaining device for boring bars especially designed for use in connection with tapping machines employed in tapping gas and water mains and in inserting and removing corporation cocks, and the invention also relates to .a novel formof tool-shank constructed for use in connection with said socket-head.

I -Although our improvements have been designed more especially for use in connection with tappinglmachines of the type referred to, we do not wish ,to be understood as limitmg ourselves to this specific application of the invention as obviously the same may be usedin connection with other types of machines.

"One object of the invention is to provide means, associated with the socket head, for securely retaining the tool therein against accidental displacement and wherein the tool may be easily and quickly inserted and removed. I p 1 Another object of the invention is to'proshankespecially designed for use in connection wlth our improved socket head. 7 A further purpose of theinvention is to provide a socket head with a novel' construction and arrangement of drift pin,

a be easily and qu ckly released from its en gagementwith the socket. in case the same read ly removed by hand. a

Other more or less important objects Wlll appear from a reading of the following detailed description taken in connection with .the accompanying drawings, wherein Figure 1 is. a plan view of a portion of a jointly invent of one .form of tap or into the socket 3, said 7, of a suitable a coil spring 9, which bears pin or detent be (1 firmly seatedtherein to be BOBINGJJARS.

Specifioation'of Letters Patent;-

' Patentceddug, 6, 1912. Application flled Apri-l 1, 1911. Serial at. 618,491. 1

NY, or-nncarnn, ILLI- boring-bar having associated therewith a:

socket headv and tool retaining device conaccording'to the present invention.

Flg. 2 is 'alongitudinal section. Fig. 3- is an end view withthe tool removed. Fig. 4 is an end view of the socket head with the annular tool retaining member or collar removed. Fig. 5 is '60 a view looking into the open endof the annulartool-retaining memher or collar. Fig. 6 is a longitudinal sec-' tion taken at right angles to Fig. 2, and showing the drift pin and its retaining means. Fig. 7 is an elevation of tool employed in corporation-cocks. Fig. 8 is an elevation drill constructed for use with our improved socket head and tool retaining device.

Referring to the drawings, numeral 1, designates a boring bar which may beof any usual co struction and havmg at one end an enlar ed head 2, provided of one form. insertlng and removmg the reference with a tool-shank receiving socket 3, which 1s preferably taperedas shown. The socket head 2, 1s externally threaded for aportion of its length,

as shown at 4, and is-further provided'with a 5, which projects key in the nstance shown, being in the form of a screw, tapped 1 Into a wall of the head 2. The said key 5,

is designed to engage a longitudinal, groove or keyway 6, formed in the shank portion tool may be in the form of a device forremoving orinserting corporation cocks, as shown in Fig. 7, or. in the form ofia tap or drill, as shown is further provided with I longitudinal bore 8,-in.the lower closed en ofwhich is .located against a thrust 10, for a purpose presently to escribed.

toolto-hold the latter against rotation relatively to the head and which .90 in Fig. 8. The said head 2, 5

.The tool locking and retainin device 1 comprises a freely ber, shown in the ing in theform of a lateral inturned tral opening 14,

15 which projects rotatable annular mempresent instance as be aflgollar 12, provided-w1th and a tool engaging lug into said opening 14, the

brought into and out of alinement with the loo ange'13,'having a censaidto-ol engaging lug being adapted to be I key ,5 int-he bore of the head and constias shown in Fig.

collar-has, therefore,

tuting the means for retaining the tool shank-within the socket 3. The outer face of the collar is preferably milled or knurled 1, in order to provide a hand-grip to facilitate turmng movement thereof. The collar 12, of the annular member is internally threaded at 16, teengage the threads 4, upon the head 2, and this a rotary and a longitudinal movement upon the head 2. The

" collar 12, is further provided with a stop lug 17, which cooperates with a fixed stop carried by the head 2, said fixed stop in the instance shown being in'the form .of a screw '18. The purpose of the stops 17 and 18, is to permit a limited rotary and longitudinal movement of the tool locking and retaining member relatively to the head,

.the said stops preventing a complete rota- -,As more clearly shown in Fig. 2, it will be seen that the I ings, the shank 7, of the ment with the lon stood that said longitudinal shoul .m positioning ment .with the key against. the collar normally bears frictionallyagainst the inner face of the flange 13' of the collar 12, andthe purpose of said thrust pin or detent is to exert. sufiicient frictional resistance 4 I to prevent free rotary movement thereof and thus cause the collar 12, to be retained in the particular position in. which it may be set.

As will be seen by referring to the drawtool is provided at its base with a contracted neck portion 18, there being an annular shoulder 19,; at the lnner end of the shank 7, adjacent said neck with which the .locln'n lug 15, cooperates to prevent removal o from the socket 5, whenthe locking lug 15, on the annular member is out. of aline- 'tudinal groove 6 formed the tool, it being undergroove 6, opens of the annular in the shank 7, 0

through or intersects the wall or 19. w When it is tool retaining device which rotated so as to bring the stop 17 into enagement with the 100 g lug 15 in aline- 5. The tool shank 7,

may then. be inserted into the socket 3, it bein understood that the key 5, fits into "the ongitudinal groove or' key-way 6 and prevent rotary movement of the relatively to the socket head. is then rotated any serves to tool shank 7, The annular member 6 5 desired distance so as toseparate the stops thrust pin .or detent 10 able pin 20, loosely bein adapted to engage 7, when-the pin .is movedin the di-.

.ment, such as a hammer, the tool shank 7,

desired to insert a tool within the sockets, the

comprises the annular member described, is

the stopsis, which will result except 17 and 18,-and take the lockin lug 15 out of alinementwith the longitu inal groove 6, in the shank 7, and'bring it behind the wall formed by the shoulder 19, and, inasmuch as rotation of the annular tool retaining member 12, moves said member lon itudinally upon the head 2, by reason of e complementary threads on said members, the locking lug 15, will be brought to bear against the shoulder 19, which serves to force the shank 7, firmly gagpment with the socket 3.

e prefer to make the stop lug 17 on the annular member 12 sufficiently long so that itwill' engagethe stop 18, onopposite sides when said member is given a complete rotation, notwithstanding the fact that said annular memberis moved longitudinally along the head 2, during its rotation.

This construction will prevent complete removal of the annular member from the head 2,.and avoid accidental loss thereof. When it is desired to remove the annular member from the head 2, the stop screw 18, may be removed which. will permit freeunlimited rotation of the annular member.

In order to assist in removing the tool from the socket in case the shank 7, should become too firmly seated therein, we have.

provided an improved form of drift-pin shown more clearly in Figs. 2 and 6. This drift-pin comprises a mounted in a transverse aperture formed through the head 2, at the base thereof and which aperture intersects the bore or socket 3 in the head, the pin being provided intermediate its ends "with a reduced portion 21, Fig. .6, and an in clined portion 22, the said inclined portion the end of the tool sha rection ofits length by any suitable instruwhich tends to by forcing the loosen the-tool in its socket same forwardly for a'slight distance. The

said pin 20, as stated,'has a free longitudinal movement transversely into locking enof the head 2,

longitudinally movand is retained from loss or accidental removal from the head, by means of a key 23, which passes through angles to the pin 20, and which key lies parallel with and closely adjacent the reduced portion 21 of the pin so as to prevent rotation thereof. The pin is further provided at one end with a head 24, designed to receive the impact of the hammer or other toolemployed in moving the same longitudinally.

We have shown and described herein a preferred form of-the invention, but we do not wish to be understood as limiting ourselves to the precise details of construction,

be limited by the terms as we may of the following claims, as 'we are aware that slight alterations maybe made withthe head at right i I invention.

What weclaim is 1. A boring bar, comprising a socket-head having a tool shank engaging key projectinginto the bore thereof, and an annular toolretaining member rotatably mounted on out departing from the true spirit of the 'said head, said annular member having a Iing lug extendin into the path of said bore and adapted to e moved into and out of alinement with the key, and stop means for limiting the rotary movement of the said member.

3. A boring bar, comprising a socket-head having a key projecting into the bore thereof, a to ol retaining collar having threaded engagement with said head and rotatable relatively thereto, said collar having an inwardly. extending tool-engaging lug adapted to be brought into and out of alinement with the key in-the bore, and stop means on the collar and head respectively for limiting the rotary movementof the collar.

4. A boring bar, comprising a socket-head having a key projecting into the bore there-v of, an. annular tool-retaining member rotatably mounted upon said head and having a laterally projecting tool engaging lug adapted to be brou ht into and out of aline ment with the key 1n the bore, a stop on'the annular member opposite the corresponding lug on said member, and a stop on the head opposite the said key in the bore, as and for the'purpose described. v f

5. A boring bar comprising a socket-head having a key projecting into the bore thereof, a tool retaining collar havingthreaded engagement with' said head and rotatable relatively thereto, said collar having an in- I wardly turnedflange and a tool engaging lug adapted to be moved into and out of alinement with the key in the bore, and stop] means onthe collar and head respectively for limiting the rotary movement of the collar.

6. A boring bar, vided with a socket to receive a tool-shank, a key projecting. into said .socket,,an annular tool retaining member rotatably mounted on said head, said annular member having a laterallyproject-ing tool engaging lug adapted to be moved into and out of alinement with the key in said socket, and

stop'means for limiting the rotative movement of the annular member relatively to the head.

7. A boring bar, comprising a head provided with a socket to receive a tool-shank,

an annular tool retaining member rotatably mounted on said head, said annular memberhaving a laterally projecting tool-engaging lug and a detent for resisting free movenie t ofthe annular member,

8. A boring bar, comprising a head provided with a socket to receive a tool-shank, anv annular tool retaining member rotatably mounted on said head, said member having an inwardly turned flange and a tool engaging lug, and a yielding detent pin norcomprising a head pro mally engaging said flange to resist free turnlng movement of the annular member.

9. A boring bar, comprising a head provided with a socket to receive a tool shank, a" collar having threaded engagement with the head and rotatable relatifiely thereto,

said collar having an inwardly turned flange and a tool-engaging lug, and said head having a longitudinal bore, and a thrust-pm yieldingly supported in said bore and having its outer. end normally in engagement with the flange on the collar. to resist free turning movement of the latter.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

ORA B. MUELLER,

'ADOLPH MUELLER,

Eweeutors of the last will and testament of H. M ueller, deceased.

ANTON O. SCHUEBMANN.

Witnesses:

.LEQNARD F. M KIBBEN, WILLIAM R. IDDLE. 

